1.) On the main page click "Manage Photos" at the top menu.2.) Then Click 'Upload Files Into Album'3.) Pick a photo, then click 'Upload' (you will get an error if something goes wrong otherwise you'll see 'Number of files currently in your album' increment up by 1.

To add to a posting ...

4.) Then, when making the post click to paper clip that says "Insert an Image File", pick your file and you're good to go.